package com.zhihu_lvliangi_android.util;

import java.util.concurrent.atomic.AtomicInteger;

import android.os.Build;
import android.view.View;

public class Utils {
	private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

	/**
	 * Generate a value suitable for use in {@link #setId(int)}. This value will
	 * not collide with ID values generated at build time by aapt for R.id.
	 * 
	 * @return a generated ID value
	 */
	public static int generateViewId() {
		if (Build.VERSION.SDK_INT < 17) {
			for (;;) {
				final int result = sNextGeneratedId.get();
				// aapt-generated IDs have the high byte nonzero; clamp to the
				// range under that.
				int newValue = result + 1;
				if (newValue > 0x00FFFFFF)
					newValue = 1; // Roll over to 1, not 0.
				if (sNextGeneratedId.compareAndSet(result, newValue)) {
					return result;
				}
			}
		} else {
			return View.generateViewId();
		}

	}
}
